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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Ecological community description using the food web, species abundance, and body size.
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Ecological community description using the food web, species abundance, and body size.

机译：使用食物网，物种丰富度和体型描述生态群落。

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摘要

Measuring the numerical abundance and average body size of individuals of each species in an ecological community's food web reveals new patterns and illuminates old ones. This approach is illustrated using data from the pelagic community of a small lake: Tuesday Lake, Michigan, United States. Body mass varies almost 12 orders of magnitude. Numerical abundance varies almost 10 orders of magnitude. Biomass abundance (average body mass times numerical abundance) varies only 5 orders of magnitude. A new food web graph, which plots species and trophic links in the plane spanned by body mass and numerical abundance, illustrates the nearly inverse relationship between body mass and numerical abundance, as well as the pattern of energy flow in the community. Species with small average body mass occur low in the food web of Tuesday Lake and are numerically abundant. Larger-bodied species occur higher in the food web and are numerically rarer. Average body size explains more of the variation in numerical abundance than does trophic height. The trivariate description of an ecological community by using the food web, average body sizes, and numerical abundance includes many well studied bivariate and univariate relationships based on subsets of these three variables. We are not aware of any single community for which all of these relationships have been analyzed simultaneously. Our approach demonstrates the connectedness of ecological patterns traditionally treated as independent. Moreover, knowing the food web gives new insight into the disputed form of the allometric relationship between body mass and abundance.
机译：在生态社区的食物网中测量每个物种的个体的数字丰度和平均体型，可以揭示新的模式并照亮旧的模式。使用来自一个小湖中上层社区的数据来说明这种方法：美国密歇根州的星期二湖。体重变化几乎12个数量级。数值丰度变化几乎10个数量级。生物质丰度（平均体重乘以数值丰度）仅变化5个数量级。一个新的食物网图绘制了由体重和数字丰度跨越的平面中的物种和营养联系，说明了体重和数字丰度之间的几乎反比关系，以及社区中的能量流动方式。平均体重较小的物种在星期二湖的食物网中较低，并且数量丰富。较大种类的物种在食物网中的位置较高，在数量上较少。平均体形比营养高度解释了数字丰度的更多变化。通过使用食物网，平均体型和数量丰富度对生态群落进行三变量描述，包括基于这三个变量的子集的许多经过充分研究的双变量和单变量关系。我们不知道有哪个社区同时分析了所有这些关系。我们的方法证明了传统上被视为独立的生态模式的相互联系。此外，了解食物网可以使人们对体重和丰度之间异形关系的争议形式有了新的认识。

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